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188                                      FIORA   INDICA.

of Sikkim, except that Pinus eatcelsa is common, and the
larch is not found west of the Kosi.

In the present state of our knowledge, it is not safe to in-
stitute a comparison between the alpine flora of Nipal and
that of Sikkinu "Wallicli's collections show us that the spe-
cies are on the whole the same. There is evidently a very
gradual change as we advance westward, partly owing, it may
be presumed, to increase of latitude and of summer drought,
and pajrtly to more obscure causes which regulate the distri-
bution of plants. The elucidation of these will, \ve trust/ be
one of the most important results of this work when com-
pleted, but witji our present imperfect knowledge of species
the subject cannot be approached. The occurrence of Sibe-
rian types in small numbers among "Wallich's alpine plaints
shows that the climate to the North becomes at last arid,
exactly as elsewhere in tUu Himalaya.

Though unable to indicate with any approach to precision
the number of Nipaleso genera and species that are common
to the Eastern and Western Himalaya respectively, we have
collected a, few instances of Himalayan Npeeion that we be-
lieve find their limits in Nipal. Of these the majority of the
Western Him&layan forms that advance no further east are
of European and Oriental genera or even species, as : 

Caltha palwirix.                           Itosa wwcfi a fa.

Delphinium vestitwn.                    Uhuuw c

Others arc more peculiarly Himalayan : 
CuamaTupH Marfiauft.                    Potcntilla afro#(Wffu
QueroiiB htnata.                                            Nijtalwixix.
Strauwsia glttncwMM*                   Spinua KamtMsfi^ic<*.
Kosa Ly<*nii
Of tlicRO the fStranwsia, though not found fwiher eastward
in the Himalaya, occurs in the Kharia, anul perhaps the Vha-
m&rqps may be the same. a the Khaaian pt?eies.  T!u- Spirata
Kwnt&chatica i a native o Eoateni SSWria,
Tlte number of Eastern Himalayan muj Khaim? IOVIIIN that